Myth or real ?

[Saintaw]

Altitude: If you fly below 500 ft AGL, your icon will not appear on enemy radar. If you fly below 200 ft AGL, no radar bar appears in the sector

Town/Field capture: You need not destroy all of the town. Extrenal tower and the Ammo bunker can stay up for a capture to happen.

I've heard both infos already, but so far... this has been unverified on my side. Is this true or not ?

[Innominate]

Altitude:
Under 200feet and you wont appear on radar, over 200feet, and you will.  i believe bar and dot are both at the same alt.

Town Capture:
The tower DOES need to be down.  The barracks and ammo bunker seem to be part of the field, they don't need to be down. (The grey huts in between them do though)